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select * from dba_histograms where owner='XXX' and table_name='YYY' and column_name='ZZZ';

Does this mean histograms are dropped for this column?

Since ENDPOINT_NUMBER represents the cumulative number of rows in the target table/column then having no other values than zero makes me think that is the way Oracle is telling there are no histograms for the particular table/column.

Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.